Entreq Olympus Cleanus

The Olympus Cleanus is Entreq's flagship passive mains filter — more accurately described as a high-frequency separator. Where most mains conditioning addresses noise after it has already entered your system, the Olympus Cleanus works at the source, drawing high-frequency interference away from your mains supply before it reaches your components. It includes all necessary cables for connecting to your system.

The Problem With Domestic Mains

Every domestic mains supply carries contamination. LED lighting, refrigerators, routers, chargers and switching power supplies all inject high-frequency interference back into the mains. This noise is not inaudible. It raises the noise floor across your entire system, masking fine detail, compressing dynamics and reducing the sense of space and separation between instruments and voices.

The Olympus Cleanus connects to a spare mains socket via an Entreq power cable. Rather than filtering in the conventional sense — which typically imposes its own compromises — it draws contamination away from the supply, absorbing high-frequency noise into Entreq's Olympus-grade mineral mix.

Tungsten Inside Technology

At the heart of the Olympus Cleanus is Entreq's Tungsten Inside technology, incorporated into the Olympus-grade mineral mix that absorbs high-frequency noise from your mains supply. Tungsten is central to Entreq's most capable products, and its presence here places the Olympus Cleanus at the top of the Cleanus range. The result is a cleaner, quieter supply reaching your components — and a noticeably darker, more resolved background to your music.

Entirely Passive — No Dynamic Compromise

Conventional active mains filters and conditioners often trade noise reduction for a loss of life and energy in the music. The Olympus Cleanus is entirely passive. It takes nothing away from the signal path. There is no compression, no loss of dynamics, no sense of the system being held back. The background simply becomes quieter, allowing music to emerge with greater purity and transparency.

This is Entreq's approach at its most characteristic: removing what should not be there, rather than adding anything new.

Ground Box Integration

The Olympus Cleanus features a silver binding post, allowing connection to an Entreq ground box via an Eartha ground cable. This gives the absorbed noise an additional path to dissipate, further lowering the noise floor. Entreq recommend pairing the Olympus Cleanus with a Silver Tellus Tungsten or Olympus 10 T ground box for the greatest impact.

For systems already benefiting from Entreq grounding, the Olympus Cleanus represents a highly effective complementary step — addressing the mains supply while your ground boxes address the signal path. Together, they form a comprehensive approach to noise management.

Who Is It For?

The Olympus Cleanus is for listeners who have invested seriously in their system and are hearing the ceiling imposed by mains contamination rather than the components themselves. If you have already addressed your signal path with Entreq grounding and want to extend that approach to the mains supply, the Olympus Cleanus is the logical next step. It is not an entry point into mains conditioning — it is the serious solution for a serious system.

Buying from Martins Hi-Fi

Martins Hi-Fi has been in Norwich since 1968. Elizabeth Gould runs the business today, and we stock only brands we have heard properly and stand behind.

You can hear the Entreq Olympus Cleanus demonstrated in our Norwich showroom, where we can show you the difference it makes in the context of a complete system.

When you get in touch, you'll be speaking with Dave, Chris and Tim — experienced specialists who can advise on this product and your whole system.

Contact us at info@martinshifi.co.uk, call 01603 627010, or WhatsApp on 07554 687137. You can read more about how we work on our Why Martins Hi-Fi page. We are at 85–91 Ber Street, Norwich, NR1 3EY.